Q.Companion Planting In California.
Hello guys, I’m actually new to gardening, and I was wondering if my combo for companion planting were good together. I’ve read online and found that Bell peppers, Cilantro, Basil, Oregano, Rosemary, Onions, and Parsley grow well when planted in March, California. So after I researched some companion plants, I’ve come up with two groups to plant together. My first group is Parsley, Basil, Oregano, and Cilantro. My second group is Bell peppers, Basil, Onions, and Rosemary. Are these good combinations? And when planting, do I just mix the seeds together beforehand, and then throw them across my vegetable bed? Also, should plant certain seeds before others? If so, when? Thanks so much for any help!

Certified GKH Gardening Expert
The best thing to do will be to grow them separately, then add them together into their container once they are established, although casting a few seeds together can work, as long as you do not drastically overseed.
This article will help with companion planting:
https://www.gardeningknowhow.com/edible/vegetables/vgen/companion-vegetable-garden.htm